Add overlooked Goto Document Start/End shortcut settings

Change-Id: I2f60e2607660cea98aebb1057226010ea4837156
Reviewed-by: David Schulz <david.schulz@qt.io>
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>

src/plugins/texteditor/texteditor.h

@@ -381,6 +381,8 @@ public:
     void gotoBlockStartWithSelection();
     void gotoBlockEndWithSelection();
 
+    void gotoDocumentStart();
+    void gotoDocumentEnd();
     void gotoLineStart();
     void gotoLineStartWithSelection();
     void gotoLineEnd();